6665477906 has 16 divisors (see below), whose sum is σ = 10092487680. Its totient is φ = 3301396560.

The previous prime is 6665477881. The next prime is 6665477921. The reversal of 6665477906 is 6097745666.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147476 + ... + 187296.

It is an arithmetic number, because the mean of its divisors is an integer number (630780480).

Almost surely, 2^6665477906 is an apocalyptic number.

6665477906 is a deficient number, since it is larger than the sum of its proper divisors (3427009774).

6665477906 is a wasteful number, since it uses less digits than its factorization.

6665477906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40609.

The product of its (nonzero) digits is 11430720, while the sum is 56.

The square root of 6665477906 is about 81642.3781255789. The cubic root of 6665477906 is about 1881.9601844506.

The spelling of 6665477906 in words is "six billion, six hundred sixty-five million, four hundred seventy-seven thousand, nine hundred six".